Jack for elevating forms and floors during the pouring of concrete



H, H. NORMAN. 2,673,066 JACK FOR ELEVATING FORMS AND FLOORS DURING THEPOURING OF' CONCRETE 3 Sheets-Sheet l.

m@ Nm www N March 23, 1954 Filed Nov. 15, 1950 INVENTOR. HAR/'e Y H.NORMAN BY WTO/F/Vlfy-5` Mrch 23, 1954 H. H. NORMAN 2,673,066 JACK FORELEVATING FORMS AND FLOORS DURING THE POURING OF' CONCRETE Filed Nov.15, 1950 3 Sheets-Sheet 2 /04 05 Sl |||l so es /08 /08 89 'Il I 89 aa 909o i INVENTOR. 8@ 65 HARP Y H. NORMAN |03 l, JOZ By a7 19 Quid.

TTOlQ/VEXS March 23, 1954 H H," NORMAN 2,673,066

JACK FOR ELEVATING FORMS AND FLOORS DURING THE POURING OF' CONCRETE yF'lled Nov. 13, 1950 3 Sheets-Sheet 3 Eff INVENTOR. HARRY H. NORMANBvb/MM A TTRNEYS Patented Mar. 23, 1954 JACK FOR ELEVATING FORMS ANDFLOORS DURING THE POURING F CONCRETE Harry Harold Norman,

to Minot Builders Sup tion of Minnesota Superior, Wis., assignor plyCo., Inc., a corpora- Application November 13, 1950, Serial No. 195,417

My invention relates to jacks `for elevating forms and doors during thepouring of concrete rand has for its object to provide free and loosedog members engaging an abutment with one end and having a bit member toengage with its :sharpened edge the side of a `rod called a jack rodwhich is embedded in and rigidly held by the concrete as it is poured.

In practice the arrangement operates in connection with a two-partelevating member, the parts of which are separated by the introductionof compressed air between them, in combination with which are two setsof clamping bits, one of which holds one of the members stationary byengagement of the bits with the jack rod dur- `ing the liftingoperation, and the vother of which holds the other member stationarywhile the `second member is restored to initial relative positionwiththe lifted member.

Free bit members unattached directly to any part of the lifting membersare `held by springs to engage the jack rod while the lifting action iseffected by upward movement of one of `the parts of the lifting member`and which hold the other part stationary when the lifted part isrestored to initial position is the invention of Roy I. Patterson,`whose applications Ser. No. 87,632 and No. 151,060 are pending in thePatent Oilice and have been assigned to the assignee of my invention.

I have discovered a novel manner of mounting the bits and holding themwith springs, which is in a high degree eilicient and dependable andwhich simplies and renders more advantageous the 'free bit struotureinthe following particulars:

Two springs instead of one spring are mounted so as to exert the forceof both springs uniformly across the body of the bit, thus insuringirlcreased power of pull on the bit and uniform distribution of pull.

The springs are so `mounted that they exert their pressure upon the bitsin a plane nearly parallel to the axis of the jack rod, thus having amuch more powerful torque of pull upon the swinging bits.

Radially extended parallel channel members are formed on the lower oneof the movable litfer members and the springs are attached to transverseribs extending between the channel members, said ribs all lying at thesame radial distance from the center of the jack rod when the liftingdevice is positioned thereon. The ribs for 'one `set of bits extendoutwardly a considerable less distance than the ribs for the other setof bits.

4 Claims. (Cl. 25d- 106) The springs areconnected to the membersoutwardly extending from the sides of the bits by means of a loop of thespring material. having a gap so that the springs can be readilyandeasily disconnected from the bits and the bits removed forsharpening, repair or exchange.

Although the springs operate `upon setsof Vbits of different lengths,all of the springs 4mounted in the above manner are ofthe same lengthwhich makes possible the use of a single length of vsprings for all ofthe bits. i

It is an object of my invention, therefore, `to employ for holding thebits two springs mounted in parallel relation and connected to ribs onthe lower plate of the lifting device, which are of different lengthsbut lie substantially in a circle.

it is a further object of my invention to Vhave radially extendedchannel members formed on the lowei one of the movable lifter `membersand to have transverse ribs secured to 4and between the channel members,the ribs for one set of bits extending outwardly `a considerable lessdistance than the ribs of the other set of bits.

It is a further object of my invention :to `provide pairs of springsconnected to each of the several ribs, each of said pairs of springsextending outside of a clamping bit and being connected to membersrigidly secured to the clamping bit and extending transversely outsidethe limits thereof.

It is a further object of my invention to have the pairs of springsemployed for each clamping bit connected to a transverse rib `at one endand connected to the bits by means of a loop of the spring materialrunning about members extended laterally from the sides of the clampingbit, said loop having an `opening whereby the springs may readily bereleased from the bits andthe bits withdrawn for sharpening, repair orrenewal. n

It is a further and important object of my invention to form the springsfor all of the bits of exactly the same length even though one set of`bits is longer than the other set.

The full objects and advantages of my invention will appear inconnection with the specieation hereinafter appended, andthe novelfeatures of the invention by which the advantageous and useful resultsabove noted are `obtained will be particularly pointed out in theclaims.

In `the drawings illustrating an application of invention in one form. i

Fig. `1 is a diametrical sectional elevation View of a lifting devicewith my `invention applied .interior wall I2.

thereto showing relations of the bits, springs and the two membersmaking up the lifting device.

Fig. 2 is a sectional plan view viewed from below taken on line 2-2 ofFig. l.

Fig. 3 is a sectional detail elevation view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional elevation view similar to Fig. 3 taken on line 44of Fig. 2.

Fig. 5 is an underside plan view of the lower plate of the liftingdevice.

Fig. 6 is a sectional view taken on line 6-5 of Fig. 5.

As shown in Fig. 1, the pneumatic lifting device has a top or upwardlymoving member I9 which includes a top annular depending flange I I whichis circular and is provided with a cylindrical The member I9 also hasintegrally connected therewith a depending sleeve I3 which surrounds ajack post I4 rigidly held in a vertical position in the concrete beingpoured, not shown. The sleeve I3 has its inner wall ground to truecircular form and is of such a length that the upper member I9 of thepneumatic lifting device will at all times be held vertical to the axisof the jack rod I4.

Formed on the flange l I are a series of depending socket members I5, I6and I1 which form abutment seats for bit members I8, I9 and 29.

A second set of bit members 2i, 22 and 23 are fulcrumed against adepending flange 24 of the second member 25 of the pneumatic liftingdevice. The member 25 is formed with a flat upper surface 26 and anopening 21 through the sleeve I3 adapted to surround and embrace thejack rod I4, and guide and hold it in its vertical movements along thejack rod.

As viewed in plan, the longer set of bits I3, I9 and bear at their endsagainst the abutment ends 28, 29 and 39 upon the ends of socket membersI5, I6 and I1. 23 bear against the downwardly extending flange 24 at 3I,32 and 33 respectively, as clearly appears in Fig. 2.

Directly below and having their inside walls substantially in the planesof the side walls of bits I'8, I9 and 20, are pairs of radially disposedribs 35 and 36, 31 and 38, and 39 and 49, which are rigidly connected tothe bottom wall 4I of pneumatic lifter member and also are connectedwith the downwardly extending ange 24 of lifter member 25.

Upon the top surfaces 26 of lifter member 25 is positioned an annularsealing plate 42 which is provided with an inner annular flange 43taking against the outer wall of the sleeve I3. The

sealer member 42 further has an outer annular ange 44 which takesagainst the annular wall 4'5 of the ange I2 of the top pneumatic liftingmember I9. There is thus formed an annular chamber 6I between the twomembers of the pneumatic lifter devices I0 and 25.

In a similar manner the bits 2I, 22 and 23 lie inside the planes ofpairs of spaced ribs running at their tops into the horizontal plane ofthe bottom of flange 24, which last named ribs are designated 46 and 41,48 and 49, and 59 and 5I respectively. These ribs are spaced apart adistance substantially equal to the diameter of the jack rod I4 as istrue of the pairs of ribs 35 and 36, 31 and 38, and 39 and 49. The setsof ribs 46 and 41, 48 and 49, and 50 and 5I, come opposite outwardlyextending lugs 52, 53 and 54 formed integrally with and extending attheir bottoms in the plane of the bottom flange 24 of the lowerpneumatic lifter member 25.

The shorter bits 2|, 22 and The arrangement of these sets of ribs issuch that there are six sets of them each extending radially and eachangularly separated the same distance, the sets of ribs 35 and 36, 31and 38, and 39 and 43 alternating with the sets of ribs 46 and 41, 48and 49, and 5B and 5I.

Ribs 36 and 41 are connected toward the middle of their lengths by anarcuate member 55. Similarly ribs 35 and 49 are connected by an arcuatemember 55, ribs 31 and 49 by an arcuate member 51, ribs 33 and 59 by anarcuate member 58, ribs 39 and 5I by arcuate member 59, and ribs 46 and46 by an arcuate member 69. The arcuate members 55, '56, 51, 58, 59 and69 taken together outline a circle and have the effect with the pairs ofradial ribs, above dened, of giving great strength to the bottompneumatic lifting member 25.

The lower surface 62 of the top pneumatic member I9 is spaced a .verysmall distance from the top surface of annular sealer member 42, asindicated at 63 in Fig. 1. However, the annular chamber 6I is widened atits outer limits, as indicated at 64 and 65 in Fig. 1, and into thisannular chamber and the space between bottom 62 and sealer plate 42compressed air may be controllably injected through opening 66 connectedwith a suitable hose, from a container of compressed air and valve meansfor permitting periodic injection of the compressed air into the annularchamber 5I. This air injecting means is of common and well knownconstruction and, therefore, is not shown.

It will be apparent, however, when air under pressure is admittedthrough opening 66 into compressed air chamber 6I it will be distributeduniformly over the annular sealing member 42 and will force outwardlyits respective flanges 43 and 44 and thus seal the chamber tight againstleakage.

The injection of compressed air into chamber 6I will result in expandingthe chamber 6I and, because the bits I8, I9 and 20 hold the lower member25 from downward movement, the expanding of chamber 6I must effectupward movement of the upper pneumatic lifting device II] which liftswith it the iioor and form structure supported on its upper surface, notshown.

As shown in Fig. 1, screwed into a threaded opening 51 in flange II oftop pneumatic lifter member I9 is a bolt or rod 58 having on its lowerend a head 69. The bolt 66 goes freely through an opening 19 in lug 54on the lower pneumatic lifter member 25 and thus will be constrained tohave the vertical movements which the top pneumatic lifter member I9 hasand to be movable relative to the bottom lifter member 25 through theopening 1G. Bolts 1I and 12 are similarly mounted to move freely throughlugs 52 and 53.

The lugs 52, 53 and l54 have arcuate ends and are mounted to have freevertical movement within recesses 13, 14 and 15 in the fiange member andthe extension 16` thereof, as clearly shown in Figs. 1 and 2.

About each of bolts 68, 1I and 12 are mounted sleeves 11, 18 and 19which are rigidly connected with the respective lugs 54, 52 and 53. Thelower ends of the sleeves 11, 18 and 19 are spaced from the bolt headsB9 a suitable distance, as indicated at 86 in Fig. 1. It follows that asthe two pneumatic lifter members I0 and 25 are separated by air pressureif, as is the fact,(the lower member 25 is restrained from downwardAmovement by bits 2l, 2 2 and 23, the movement must be imparted to theupper 'pneumatic lifter member lll.

This will carry upwardly all the bolts '68, 'H and :'12 movable within`the sleeves Tl, 18 and ls, lifting the bolt heads Sil with the boltsand comn pressing springs Si on the bolts between the re spective lugsiid, di. and When, therefore, the pressure is released, letting the airescape, the upper pneumatic `lifter member it will be held stationary bythe dogs it, it and iz@ and the springs Si, acting in consort, will`push the lower pneumatic lifting member 25 upwardly to initialposition.

This operation will normally lift the top mem- `ber IIl and the partscarried thereby `a very small distance each time the air pressure isapplied and released. In practice it has been found eifective to havethis distance from onenfcurth to three-eights `of an incl'z. It followsthat rapid repetition ci the lifting operation will soon produce anover-all lift through any Adesired distance.

A plate 82, Fig. l, preferably of a substantially `lfieavy steel, has acentral opening t3 by which Ithe plate is mounted upon the jack rod i4.Other openings et, as indicated in Fig. 1, receive the bolts tid, 'iland l2 so that the plate will then rest upon the bolt heads te. When inthat position the plate 82 anchors the bolt heads to the jack rod M andeil'ectively prevents any rocking or swinging thereof which might putsufiicient strain on Veither the iiange ii or the bolts 68, 'H and "l2to cause breakage. This' breakage is `very effectively prevented by theplate 32' mounted as stated.

The two sets of bits it?, i9, 2t, and 2i, 22, 23, respectively, are eachprovided with pins ill whose opposite ends t5 and at are shownprojecting outwardly in opposite directions from the planes of the sidesof the bits. Member Sl is welded or otherwise permanently secured acrossthe bottom faces of bits i8, it `and 2li, 2l, 22 and 223.

Each bit of either type has connected therewith two springs its and tewhich extend outside of and along the side faces of the bits, as clearlyshown, in Fig. 2. At the opposite ends of each spring are loops il@ andSi. At least the loops 9) have a gap 92, as indicated in Fig. l, whichis of suiicient width to permit the loops 9o readily to be withdrawnfrom the projections at and 85 to permit quick and easy removal of thebits.

.As shown in Fig. 5, there are two sets of transverse ribs between thesets oi" respective ribs 35 and 35, :il and 33, and d@ and iid; and theother set of ribs d@ and ill, lli and t9, and tu and El. The transverseribs for the first set are designated 93, @It and The transverse ribsfor the second set are designated as 9S, Si and t8. As clearly shown inFig. 1, the transverse ribs 93, lili and t5 come out substantially intothe plane of the bottom of the flanges 99 and 2d and of the annularsleeve S9 formed integrally with pneumatic lifting member As clearlyshown in Fig. l, the transverse ribs 9B, 97 and tt project onlyT a shortdistance from the lower plate iii. The sets oi springs 88, t9 for thelonger bits I8, i9 and 2li are connected to longer ribs Q3, (it andwhile the sets of springs for the shorter bits 2l, 22 and 23 areconnected to the shorter ribs 95, 91 and et.

Thus, although the shorter bits 2l, 22 and 23 engage with their edgesit, the jack rod at a point closer to the pneumatic lifting member 25 .6than the :point of engagement of the :edges flll of the longer bits i8,I9 :and 120 with the jack rod, the above arrangement 4enables `springs`of the same length to `be employed.

The connection of the springs `with the `bits and the transverse ribs iswell `shown `in the deh tailed Figures 3 and 4. In both cases the springloops of the springs 83 and 89 lie .in planes parallel with the sidewalls vICH and. ,H23 of `the bits It, it and 2t, while similar loops |04and los are in similar planes connected. through openings It@ and itl intransverse ribs 93 (the` same in connection and e8).

As shown in Figs. 1 and 4, vthe ribs `46, `4l, 48, 49 and 5t, 5l are cutout part way down, as indicated at liil, to permit the springs `8l) andtill to move in toward the tops of the reduced transverse ilanges 96,Ell' and 98.

lIn Fig. `2 the sharpened edges of the dogs I8, I9 and 2t which engagejack rod l are indicated Yby numeral |99. Similar edges H30 of the bits2li, 21| and 22 are provided for engaging jack rod hi at a higher pointthereon.

The advantages of my invention will be `apparent from the abovedescription. A principal advantage comes from the use of two springs foreach bit connected at the two sides of the bit over projecting members,which as shown,` are the ends se, tti of transverse cylindrical memberspreferably welded to the bottom face of the'dogs. This insures a verypowerful pull from the two springs distributed throughout the width `ofthe bit, and holds the sharpened ends oi? the bits at the proper angleto engage the jack rod.

Another great advantage resides `in the fact that the connection of thesprings to full length and shorter transverse ribs on the lower one ofthe two pneumatic lifter members, one set oi' ribs being of greaterdepth than the other set makes possible the use of uniform springs ofthe same length.

A further important advantage from the `above form of attachment is thatit enables the springs to be extended very nearly at right angles to thelengthwise extent of the bits, thus greatly increasing the torque pullof the bits against the jack rod.

Iclaim:

i. In a jack for elevating forms and iloors during the pouring ofconcrete, a jack rod along which the jack is adapted to move, a two-partpneumatic lifting member including an. upper part having a dependingflange forming within it a chamber and a lower part therein movablealong said flange, said lower part being formed with two sets ofseparated pairs of substantially radial ribs spaced apart, a transverseflange between each pair of ribs of one set extending to the top planeof said radial ribs and forming an abutment therebetween on the lowermember, a flange between each pair of the second set of radial ribsextending only part way to the tops of said radial ribs, each of said:flanges of both sets having formed therein two suitably positionedopenings the upper member having downwardly extending parts formingabutments, two sets of clamping bits each free from permanent attachmentto any part of the jack, the bits of one set adapted to have one endengage in abutment on the lower lifting part and the bits of the otherset adapted to have one end engage an abutment on the upper liftingpart, the other ends of all the bits being sharpened for engagement withthe jack rod, members secured to the with transverse ribs 96, 9:1

.lack rod.

2. In combination with a vertically extending jack rod, a jackcomprising a first plate surrounding said rod having an annulardepending flange on the outer lateral limits forming a chamber in thelower surface of said plate, a second plate surrounding said rod andformed to fit within the chamber of the iirst plate with its top surfacesubstantially contiguous to the bottom surface of the first plate, aresilient connection extending between said rst and second plates andforming a follow-up connection between said plates, two sets of clampingbits supported beneath said plates having sharpened ends engaging thejack rod, one of said sets extending from the depending flange of thefirst plate to anchor Said plate to the jack rod during relativemovement of the second plate, the other of said sets extending from thesecond plate to the jack rod to anchor said plate to the jacl; rodduring relative movement of the rst plate, projections extendinglaterally from each of said bits adjacent their sharpened ends, fiangesdepending from the lower surface of the second plate, and two springsextending between the projections on each bit and the anges on the lowersurface of the second plate and in a plane nearly parallel to the axisof the jack rod to bias the sharpened ends of the bit against the jackrod.

3. In combination with a vertically extending jack rod, a jackcomprising a rst movable member encompassing the jack rod, a secondmovable member encompassing the jack rod beneath the first member, saidrst member being movable relative to the second member, a resilientconnection extending between said first and second members forming afollow-up connection between said members, two sets of clamping bitssupported beneath said members having sharpened inner ends engaging thejacl; rod, one set extending angularly from each of said members toanchor the respective member to the jack rod during relative movement ofthe other member,

projections extending downwardly from the sec-'- ond movable memberadjacent each of the clamping bits, and a pair of springs extending fromeither side of each of said clamping bits adjacent their sharpened endsto said projections and in a plane nearly parallel to the axis of thejack rod to bias the sharpened ends of the bits against the jack rod.

4. In combination with a vertically extending jack rod, a jackcomprising a first plate surrounding said rod having an annulardepending flange on the outer lateral limits forming a chamber in thelower surface of said plate, a second plate surrounding said rod andformed to t within the chamber of the rst plate with its top surfacesubstantially contiguous to the bottom surface of the rst plate, a thirdplate surrounding said rod and spaced below the second named plate, aplurality of headed guide rods depending from the annular flange of thefirst plate penetrating the second plate and the third plate with theheads engaging the lower surface of the third plate, a spring on eachguide rod extending between the third plate and the second plate andbiasing the second plate in the direction of the first plate, a firstset of clamping bits having sharpened ends extending from the annularflange of the first plate to the jack rod above the third plate, asecond set of clamping bits of shorter length than the first set havingsharpened ends and extending from the bottom surface of the second plateto the jack rod above the third plate, projections extending downwardlyfrom the second plate adjacent each of the several clamping bits, and apair of springs extending from either side of each of the clamping bitsadjacent their sharpened ends to said projections and in a plane nearlyparallel to the axis of the jack rod to bias the sharpened ends of thebits against the jack rod.

HARRY HAROLD NORMAN.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,528,857 Strandberg et al. Mar. 10, 1925 1,649,674 Egan Nov.15, 1927 2,016,575 Nemec et al. Oct. 8, 1935 2,227,394 Lucker Dec. 31,1940

